Input validations

Input validations are is a way to add more constraints to a field. They are specified using annotation on checked field.

import {
  InputValidation as validation,
  SchemaDefinition as d,
} from "@contember/schema-definition";

export class Article {
  @validation.assertNotEmpty("Article title cannot be empty")
  title = d.stringColumn().notNull();
}

Useful input validations include:

assertNotEmpty(errorMessage) - checks that field is not empty (null or empty string)
assertDefined(errorMessage) - checks that field is not null
assertPattern(regExp, errorMessage) - checks that field matches given regular expression
assertMinLength(min, errorMessage) and assertMaxLength(max, errorMessage) - checks that string is at least (or at most) of given length